Ab urbe condita

Titus Livius (Livy)

Livy. History of Rome, Volumes 1-2. Roberts, Canon, Rev, translator. London, New York: J. M. Dent and Sons; E. P. Dutton and Co., 1912.

Not only were the freeborn and all within the military age obliged to take the oath, but cohorts were formed of the older men, and even the freedmen were formed into centuries. Arrangements were made for the defence of the City, and P. Sempronius took supreme command.